the carbon underground. the financial services company stripe has already paid charm to offset more than 400 tonnes of carbon. microsoft is also working with the company. but the big problem here is cost and scale. using this process to offset carbon emissions, a return flight from london to new york, for example, currently costs nearly $11,000. sean kinetic is charm s chief scientist. this process is expensive at $600 per tonne. that s not economical, is it? absolutely not. i think that the. the price point of carbon removal is difficult for permanent removals. sean argues that although other types of carbon offsetting are much cheaper, this method produces permanent carbon removal. when we put it on underground, it will remain underground for 10,000 years, versus a tree that s planted which may extract carbon for 100 years, but then decay. we put charm s idea to two climate change experts. first, mike mcguirk from the colorado school of mines. i think this concept is conceptually ver
first, mike mcguirk from the colorado school of mines. i think this concept is conceptually very powerful. itjust comes down to efficiency and costs, and unfortunately that s not unique to them whatsoever. when it comes to carbon capture, the questions have always been efficiency and cost. and then the carbon removal expert, robert hoagland. from what we re seeing and how they re approaching it, they re doing in a very responsible and safe way so that you re taking carbon and you re actually storing it permanently, i would say there s very little doubt about that. it s solid tonnes. the question is more, is this a pathway that we want to see on a very large scale? charm wants to build thousands of these units on farms and forests. they have lofty ambitions. however, angela has heard grand ideas like this before, but she s not convinced. i think sort of the smaller scale portable type of operations would be very useful in the santa cruz